*{
    margin: 0;
    padding: 0;
    border: 0;
}
.layui-bg-cyan{
    height: 720px;
    width: 100%;
    overflow: hidden;
}
.layui-bg-gray{
    width: 40%;
    height: 50%;
    margin: 0 auto;
    margin-top:150px ;
    box-shadow: 0 17px 10px -8px #888888 inset,
                5px 5px 5px #888888 inset,
                5px 5px #888888 inset,
                -5px 5px 5px #888888 inset;
    overflow: hidden;

}
.user{
    height: 35px;
    width: 280px;
    background-color: white;
    box-shadow: 0 3px 5px -4px #888888 inset,
    2px 2px 2px #888888 inset,
    2px 2px #888888 inset,
    -2px 2px 2px #888888 inset;
    outline: none;
    font-size: 20px;
    display: block;
    margin: 0 auto;
}
.password{
    height: 35px;
    width: 280px;
    background-color: white;
    box-shadow: 0 3px 5px -4px #888888 inset,
    2px 2px 2px #888888 inset,
    2px 2px #888888 inset,
    -2px 2px 2px #888888 inset;
    outline: none;
    font-size: 20px;
    display: block;
    margin:0 auto;

    overflow: hidden;
}
.hydl{
    height:50px ;
    width: 200px;
    margin: 0 auto;
    display: block;
    text-align: center;
    font-size: 30px;
    margin-top: 45px;
}